Roundhouse (https://en.wikipedia.org/wiki/Roundhouse_(TV_series)) or Welcome Freshmen (https://en.wikipedia.org/wiki/Welcome_Freshmen). In other words, the bridges from You Can't Do That On Television to All That.

https://upload.wikimedia.org/wikipedia/en/1/1f/Welcome_Freshman.jpg

https://upload.wikimedia.org/wikipedia/en/thumb/b/b3/Roundhouselogo.png/250px-Roundhouselogo.png

Welcome Freshmen